AMD has released quite some impressive cards lately, the r7 380x seems ridiculously

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AMD has released quite some impressive cards lately, the r7 380x seems ridiculously good for the price, but... why should i get it?

I'm looking for a card that can:

-Replace my aging 8800 GT, which i can't even play path of exile or warframe above 800x600 without lag or
-Perform at 1280x1024 a resolution that i use because it's better with one working eye and because the monitors offer better contrast ratios than most reasonably priced 1080p variants
-Uses little power as I have no interest in replacing my 400w PSU
-Will be able to just sit in my case for the next 5 years or so playing whatever i want it to at full monitor resolution regardless of settings, as i'm not a graphics whore.

I first considered entry level amd cards but found they were all horse shit wastes of money, then looking at the 750 ti, i felt it would just not remain relevant long enough.

Now I'm leaning towards the gtx 960 4gb version by gigabyte. I probably won't ever need 4 gb instead of 2 at this resolution but since i intend to leave this in there for a good long while like i did with my 8800, it can't hurt to try to be a little future proof, can it?

If anyone knows of any AMD cards that can offer me the kind of performance to power ratio as the 960 let me know. I really like AMD as a company and as much as I would like to support them, I can't see a viable product for me.